Ignore spin drift.

The guy shooting to the north has a bullet that is moving to the east faster than the target is, so his bullet hits to the right of POA.

The guy in the southern hemisphere does hit left of POA in every case. If you add in spin drift to the right, that will negate the effect of Coriolis at some distance, which pushes the bullet to the left regardless of which direction you're pointing (except for due east or west).

Read my previous post again. It explains Coriolis without taking spin drift into account.